Concrete pile



0. A. MECHLIN CONCRETE FILE Nov. 21, 1933.

Filed June 25, 1951 3% Odcar flzecjzz' Patented Nov. 21, 1933 CONCRETEPILE' Oscar A. Mechlin, New York, N. Y., assignor to Ernest F. Mechlin,Washington, D. 0.

Application June 25, 1931. Serial No. 546,880

' 4 Claims. (01. 6156) The invention relates to a concrete pile andmethod of making the same.

The invention relates to a concrete pile, preferably of the precast typein which the disadvantages which have limited to a large extent the useofprecast piles is avoided.

Before referring to a detailed description of my invention it might beadvantageous to point out that in the use of precast piles the period oftime required for the setting of the pile is roughly proportional to thelength'of the pile. The greater the length and diameter orcross-sectional area, the greater the length of time required for thepile to harden sufiiciently to be either transported or driven.

Another difficulty with precast piles relates to the necessity forreinforcing the same in order that they may be both transported anddriven. This reinforcement becomes exceedingly heavy when the pile is ofgreat length and adds very materially to the cost of the piling.

In tests of foundations previous to undertaking piling work, it is oftenimpossible to judge r from such tests as to the necessary length of thepiles and to'avoid the difficulty of joining one or more sections inorder to bring the head of the pile to its desired level, precast pilesare often made longer than required, which results in a great waste ofmaterial, since the excess portion of the pile must be removed so as tobring the pile head or end to its desired elevation.

The above named disadvantages and objections are overcome by theinvention herein set forth.

Referring now to the drawing,-

Figure 1 is a view, partially in elevation and partially in longitudinalsection, of a pile showing the driving follower, driving pipe, innershell and reinforcing members.

Figure 2 is a cross section on line 2-2 of Figure 1.

Figure 3 is a view similar to Figure 2 with the driving pipe omitted andillustrating the method of adding to the pile after the same has 45 beendriven to the desired depth.

Figure 4 is a top plan view of the follower showing it in its unformedstate.

Throughout the drawing and specification like parts are designated bylike reference characters.

In the drawing 1 indicates a precast pile having mounted on the upperend thereof a follower member 2 which is formed with a flat uppersurface 3 and marginal flanges 4, it being of course understood thatwhile the follower 2 in the present embodiment is shown rectangular inoutline the shape of thefollower will be such as to con- [follower Iprovide a cylindrical ring 6 which may be and preferably is convenientlyconnected to the upper. face of the follower by welding. The diameter ofthe'ring 6 is less than the maximum Width of the upper face of thefollower 2so as to leave'a marginal portion against which the drivingring or pipe 7 is adapted to seat at its lower end. The ring 6 and theflanges 4 may be considered as oppositely directed flanged portions ofthe follower 2, the ring or collar 6 being of equal or greater heightthan the flanges 4, the said ring being adapted to form a centeringmeans for the driving pipe 7 which is adapted to telescope over theouter surface of the ring 6.

The flat face of the follower 2 is provided 5 with a plurality ofopenings 8 through which the reinforcing rods 9 are adapted to extend.The follower 2 may be formedfrom a blank substantially rectangular inshape, having corners cut as at 10 to provide marginal flange portions 4which are then bent downwardly along the dotted lines 11 and the edgesof the corner portions 10 welded or otherwise firmly united.

Preferably I provide an opening 12 in the upper face of the followerwhich permits a bond between the precast pile 1 and the filler portion13 which will now be described. The pile 1 is precast with thereinforcing rods. 9 extending above the upper face thereof a sunicientdistance to form a rigid connection between the precast pile and thefiller section 13. The follower 2 is then fitted over the end of thepile or the pile may be formed with the follower 2 located in situ andafter the pile 1 has hardened sufficiently to permit its transportationand driving, the driving ring '7 is placed in position and the blows ofthe hammer delivered to the upper surface thereof until the pile hasbeen driven to a sufiicient or desired depth. A tube 14 is then insertedwithin the driving ring, the ex- 19 terior diameter of the said tubebeing slightly less than the interior diameter of the collar 6, thedriving ring then withdrawn and the inner tube filled with concrete tothe desired height. If necessary or desirable additional reinforcing 1members may be connected to the reinforcing bars 9 and the pile is thencompleted and upon the hardening of the filler portion 13 there isformed a unit pile of the desired length and dimensions, the fillerportion being rigidly united 110 to the precast portion so as to preventany possibility of lateral slippage or separation of the two. The pipeor tube 14 may be made of light sheet metal which is easily cut so thereis a minimum of wastage and a minimum of difliculty in completing thepile to the desired height.

Having thus described my invention, what I claim and desire to secure byLetters Patent is:

1. The combination with a precast concrete pile having longitudinalreinforcing rods embedded therein and projecting thereabove, of acombined driving cap and follower provided at its underside with aflange embracing the precast pile flush with the sides thereof andprovided at its top with an upstanding flange, said combined cap andfollower having openings for the passage of said reinforcing rods, and adriving pipe telescopically engaged with the second named flange.

2. The combination with a precast concrete pile having longitudinalreinforcing rods embedded therein and projecting thereabove, of acombined driving cap and follower provided at its underside with aflange embracing the precast pile flush with the sides thereof andprovided at its top with an upstanding flange, said combined cap andfollower having openings for the passage of said reinforcing rods, ashell telescopically engaged with the second named flange adapted to befilled with concrete, said combined cap and follower having a centralopening enabling the concrete to unite onto the precast pile.

3. The combination with a precast concrete pile having longitudinalreinforcing rods embedded therein and projecting thereabove, of acombined driving cap and follower provided at its underside with aflange embracing the precast pile flush with the sides thereof andprovided at its top with an upstanding flange, said combined cap andfollower having openings for the passage of said reinforcing rods, adriving pipe telescopically engaged with the second named flangeexterior-1y thereof, and adapted to be removed after the precast pile isdriven, and a shell telescopically engaged within the second namedflange and adapted to be filled with concrete after the precast pile isdriven.

4. The combination with a precast concrete pile of rectangular crosssection, of a combined driving cap and follower of rectangular formhaving depending marginal flanges embracingly engaging and recessed intothe sides of the upper end of the precast pile so as to be flushtherewith, said cap and follower being provided at its top with anupstanding cylindrical flange spaced inwardly from the edges to define aflat seat between it and the edges, a driving pipe telescopicallyengaged upon the exterior of said cylindrical flange and abutting saidseat, and a shell telescopically engaged within said second named flangeand adapted to be subsequently filled with concrete to form acast-in-place extension on the precast pile.

OSCAR A. MECHLIN.

